<template>
    <div>数字：{{ num }}</div>
    <button @click="add">+1</button>
    <button @click="dec">-1</button>
</template>
<script setup>
import { ref } from 'vue';
        let num=ref(1);
        function add(){
            num.value++;
        }
        function dec(){
            num.value--;
        }
</script>
<style>

</style>